Best Time to Fly BNA to PWM: On-Time Stats by Hour & Airline
Nashville International → Portland International Jetport
Data through July 2026 · Last updated October 18, 2026
160 flights were scheduled from Nashville (BNA) to Portland (PWM) in the last 12 months, and 81.1% of those that flew arrived on time, 3.5 points above the US average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
September has been the best month (97% on time) and Thursday the weakest day of the week (68%).
0.6% of flights were cancelled, versus 1.8% nationally.
BNA to PWM on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Southwest Airlines | 81.1% | 38 min | 0.6% | 160 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly BNA to PWM
On-time arrival % by scheduled departure hour (local time), 317 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | Limited data | 1 | |
| 9am–10am | 95.8% | 0.0% | 48 |
| 10am–11am | 93.2% | 0.0% | 44 |
| 11am–12pm | 68.0% | 1.0% | 98 |
| 12pm–1pm | 81.4% | 0.0% | 43 |
| 1pm–2pm | 66.2% | 0.0% | 71 |
| 2pm–3pm | Limited data | 5 | |
| 4pm–5pm | Limited data | 4 | |
| 5pm–6pm | Limited data | 1 | |
| 7pm–8pm | Limited data | 1 | |
| 9pm–10pm | Limited data | 1 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on BNA to PWM
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Summer peak (Jun 15 - Aug 15) | 65.0% | -22.0 pts | 0.8% | 124 |
| All other days | 87.0% | — | 0.0% | 193 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).